AAIC: Accounting Authority Identification Code
ADU: Above Deck Unit
AOR: Atlantic Ocean Region
AOR-E: Atlantic Ocean Region East
AOR-W: Atlantic Ocean Region West

BDU: Below Deck Unit

CDR: Call Data Record
CSV: A CDR billing format

D.91: A CDR billing format
DECT: Acronym for Digital European Cordless Telephony
Duplex: Simultaneously bi-directional independent transmission in both directions

FSC: Fleet Service Center
FTP: Acronym for File Transfer Protocol

GAN: Global Area Network
GMDSS: Global Maritime Distress and Safety System

HSD: High Speed Data

IMN: Inmarsat Mobile Number
ISDN: Integrated Services Digital Network
ISM: International Safety Management Code (Digital telephone system combining voice and data transmission)
ISN: Inmarsat Serial Number
ISP: Inmarsat Service Provider

LAN: Local Area Network
LES: Land Earth Station
LESO: Land Earth Station Operator

MES: Mobile Earth Station
MPDS: Mobile Packet Data System

NSP: Navarino Support Package
NCS: Inmarsat Network Coordination Station

PIN Code: Personal Identification Number Code
PSA: Point of Service Activation
PSTN: Public Switched Telephone Network
PUK: Personal Unblock Key

RJ-11: Telephone connector
RJ-45: Ethernet connector

SIM: Subscriber Identification Module
SSAS: Ship Security Alert System